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3.
The field acquisition domain is a semi-cylindrical domain of R = 0.75 m, from 0º to 180º in f , and from -0.6 to +0.6 m in z , ensuring that most of the backscattered field is collected. The field scattered by the object-under-test is calculated using a Physical Optics (PO) code. A full wave Method-of-Moments method could have been used, but in order to speed up the forward problem, PO fulfills this requirement providing accurate results. The incident field on the object-under-test is a z-polarized spherical wave, generated by a reflector antenna capable of providing a narrow beam along z direction. At 60 GHz, the -3 dB beamwidth is about 1.5 cm, thus being possible to consider just one slice of the object having 3 cm thickness in z . The working frequency band is taken from 60 to 66 GHz, in 600 MHz-steps (11 frequencies). Problem description The field observation domain is sampled each 0.63º in f and each 27.3 mm in z , resulting in 12672 observation points. An equivalent current distribution is reconstructed from the scattered field acquired on the observation domain on several slices along z axis. 19 slices from -135 to +135 mm in z axis, separated 15 mm each are considered. Each slice has a size of 300 x 200 mm, being discretized in 2.25 x 2.25 mm square patches. Retrieved mesh is obtained from the combination of the SAR images on each slice. Inverse procedure